Josh,

Good to know I’m not the only one that encountered this before. As for the image not showing up in Drupal/Islandora, try clearing the Drupal image cache to force the image to reload.

 

 

Rick

 

 

From: Josh Wilson [mailto:joshwilsonnc@gmail.com]
Sent: Friday, May 03, 2013 4:31 PM
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] Issue with TN datastream/PNG images

 

Rick,

Thanks a lot for your thoughts. Your instincts were right. This prompted me to check the data stream, and sure enough, seems like it never got ingested properly. I did so manually in the Fedora admin client and can now view it in Fedora just fine. Still not visible in Drupal via Islandora, so it certainly suggests that Islandora is having trouble creating and viewing this file in the repository. Will return to investigating that side of things.

Josh

 

On Wed, May 1, 2013 at 5:03 PM, Richard Sarvas <Richard.Sarvas@lib.uconn.edu> wrote:

 

Josh,

If the pack sniffer also shows the data getting truncated you might want to verify that the TN data stream exists in the form you are expecting in the fedora repo file system (not a truncated ingest). I’ve had situations where this has happened, though this was due to my Perl code sending binary content for ingest that stopped reading the binary file content at the first NUL char it encountered and sent the content of truncated file to Fedora for ingest (successfully). Mostly this happens on Windows boxes and ever since then I got into the habit of setting “binmode” before doing file reads or writes even if the Perl code will only ever run on UNIX boxes. Other languages running on Windows may also require something like this as well before doing file operations on binary files.

 

Just mentioning it since I noticed you were using IIS.

 

 

Rick

 

 

 

 

From: Josh Wilson [mailto:joshwilsonnc@gmail.com]
Sent: Wednesday, May 01, 2013 4:38 PM
To: Support and info exchange list for Fedora users.
Subject: Re: [fcrepo-user] Issue with TN datastream/PNG images

 

Rick,
I appreciate the suggestion. Not resolved yet, but I'm thinking along the same lines. I don't think it's a case of the browser not being able to read the data, I think the data isn't getting through. For some reason, with this data stream, I only get what appears to be the first 48 bytes. Everything else I've checked comes through fine. Just haven't figured out why yet. I haven't used Wireshark, but I'll give that a try to see if it can tell me something the other tools I'm trying can't.

 

On Wed, May 1, 2013 at 12:22 PM, Richard Sarvas <Richard.Sarvas@lib.uconn.edu> wrote:

Josh,

In case you haven’t resolved this one yet, I’d suggest using a packet sniffer or CURL to see what is going on (provided you are not testing a localhost connection). Browsers (by design) have a pesky habit of caching images, so in cases like this you can’t always be sure what you are looking at (or not) in the browser is what is currently being delivered by the server. Wireshark (http://www.wireshark.org/download.html) is my current tool of choice but any other packet sniffer would also work. While there are easier ways to ways to verify what content is being sent from the server (such as the Firebug browser add-on or the CURL command line util) I prefer a packet sniffer because that’s just what I’m used to using from my client/server app development days. Other HTTP request monitoring tools may work better for you.

 

Once you’ve verified that the content is either being delivered or not (Fedora XACML policy in place preventing direct access except by localhost?) then you can move on to verifying if you browser (or more than one) can correctly interpret the TN image data.

 

 

Rick

 

 

From: Josh Wilson [mailto:joshwilsonnc@gmail.com]
Sent: Friday, April 26, 2013 5:08 PM
To: fedora-commons-users@lists.sourceforge.net
Subject: [fcrepo-user] Issue with TN datastream/PNG images

 

Hi all,
I'm working on an Islandora install, using Fedora 3.5, on a Windows IIS7 server.

I've been having an ongoing issue with getting Islandora running, but I think I've traced the problem back to something specific with Fedora. Fedora doesn't seem to be able to view the TN datastream (a thumbnail PNG image that Islandora uses). If I browse around in Fedora, I can view all Islandora datastreams except for the TN, which for islandora:root is a folder PNG. When I try to see that in the browser (i.e., http://[ip redacted]:8080/fedora35/objects/islandora:root/datastreams/TN/content) I get an error in Firefox (in IE, I just get the broken image box with a red X):


'The image “http://[ip redacted]:8080/fedora35/objects/islandora:root/datastreams/TN/content” cannot be displayed because it contains errors.'

I know this sort of error can have a lot of causes. I've personally seen something like it when I was working with some images that had been saved with a CMYK color scheme. But in this case it seems that the image is either being truncated or there's some other configuration problem with Fedora which prevents it from being served. I'm pretty new to Fedora and unfortunately I don't know how to go about diagnosing the problem in further detail or fixing it. Any suggestions?

Some additional observations:

--Nothing shows up in the Fedora or Tomcat logs when this error occurs.

--I can see the image fine if I don't go through Fedora, i.e., http://[site name]/[path to image]/folder.png

--I thought perhaps there was some PNG-specific issue, so I tried embedding the folder image into a Tomcat page ($CATALINA_HOME/webapps/ROOT/index.html), but when I go to localhost:8080 it shows up.

Thanks for any help.


------------------------------------------------------------------------------
Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET
Get 100% visibility into your production application - at no cost.
Code-level diagnostics for performance bottlenecks with <2% overhead
Download for free and get started troubleshooting in minutes.
http://p.sf.net/sfu/appdyn_d2d_ap1
_______________________________________________
Fedora-commons-users mailing list
Fedora-commons-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/fedora-commons-users

 


------------------------------------------------------------------------------
Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET
Get 100% visibility into your production application - at no cost.
Code-level diagnostics for performance bottlenecks with <2% overhead
Download for free and get started troubleshooting in minutes.
http://p.sf.net/sfu/appdyn_d2d_ap1
_______________________________________________
Fedora-commons-users mailing list
Fedora-commons-users@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/fedora-commons-users